Hi !
For those how have been wasting hours trying to make split screen work and have tried ALL ... Have you even tried to verify if Mission Control is enabled ?
Ahah, it was NOT on my MBP !!
Just download a soft like ONYX, got to "Applications" in the Param. tab, and you'll find an option to activate/deactivate MC ...
Enabling MC with terminal command line can be done with something like that, but please be aware that I'm not sure at all if this syntax is still good with Captain (it was on older OSX, type it without quotes ...) :
"defaults delete com.apple.dock mcx-expose-disabled && killall Dock"
Hope this helps
